Theory of diffusion-accommodated grain rotation in columnar polycrystalline microstructures

被引:139
作者
Moldovan, D [1 ]
Wolf, D [1 ]
Phillpot, SR [1 ]
机构
[1] Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA
关键词
grain rotation; grain growth;
D O I
10.1016/S1359-6454(01)00240-3
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
A dynamical theory of grain rotation in columnar polycrystalline microstructures is developed based on the theory of diffusion-accommodated grain-boundary sliding by Raj and Ashby. The driving force for rotation of any given grain is given by the aggregate torque on the grain, i.e., by the weighted sum of the energy derivatives with respect to the misorientations of all the grain boundaries delimiting the grain. Analogous to the Raj-Ashby theory. grain rotation is viewed as a sliding problem on the periphery of the grain; the necessary changes in the grain shape during rotation are assumed to be accommodated by diffusion either through the grain boundaries or through the grain interiors. Our main result is an analytic expression for the rate of rotation of a grain of arbitrary shape as a function of the grain size and temperature. This expression reduces to an earlier result of Harris et al. for the special case of a regular-hexaggonal grain shape. (C) 2001 Published by Elsevier Science Ltd on behalf of Acta Materialia Inc.
引用
收藏
页码:3521 / 3532
页数:12
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